package com.shujuwuliankeji.ems.cloud.gateway.service.impl;

import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.concurrent.TimeUnit;

import javax.annotation.Resource;
import javax.imageio.ImageIO;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.FastByteArrayOutputStream;

import com.google.code.kaptcha.Producer;
import com.shujuwuliankeji.ems.cloud.common.core.constant.CacheConstants;
import com.shujuwuliankeji.ems.cloud.common.core.constant.Constants;
import com.shujuwuliankeji.ems.cloud.common.core.exception.CaptchaException;
import com.shujuwuliankeji.ems.cloud.common.core.utils.StringUtils;
import com.shujuwuliankeji.ems.cloud.common.core.utils.sign.Base64;
import com.shujuwuliankeji.ems.cloud.common.core.utils.uuid.IdUtils;
import com.shujuwuliankeji.ems.cloud.common.core.web.domain.AjaxResult;
import com.shujuwuliankeji.ems.cloud.common.redis.service.RedisService;
import com.shujuwuliankeji.ems.cloud.gateway.config.properties.CaptchaProperties;
import com.shujuwuliankeji.ems.cloud.gateway.service.ValidateCodeService;

/**
 * 验证码实现处理
 *
 * @author ruoyi
 */
@Service
public class ValidateCodeServiceImpl implements ValidateCodeService {
	@Resource(name = "captchaProducer")
	private Producer captchaProducer;

	@Resource(name = "captchaProducerMath")
	private Producer captchaProducerMath;

	@Autowired
	private RedisService redisService;

	@Autowired
	private CaptchaProperties captchaProperties;

	/**
	 * 生成验证码
	 */
	@Override
	public AjaxResult createCaptcha() throws IOException, CaptchaException {
		AjaxResult ajax = AjaxResult.success();
		boolean captchaEnabled = captchaProperties.getEnabled();
		ajax.put("captchaEnabled", captchaEnabled);
		if (!captchaEnabled) {
			return ajax;
		}

		// 保存验证码信息
		String uuid = IdUtils.simpleUUID();
		String verifyKey = CacheConstants.CAPTCHA_CODE_KEY + uuid;

		String capStr = null, code = null;
		BufferedImage image = null;

		String captchaType = captchaProperties.getType();
		// 生成验证码
		if ("math".equals(captchaType)) {
			String capText = captchaProducerMath.createText();
			capStr = capText.substring(0, capText.lastIndexOf("@"));
			code = capText.substring(capText.lastIndexOf("@") + 1);
			image = captchaProducerMath.createImage(capStr);
		} else if ("char".equals(captchaType)) {
			capStr = code = captchaProducer.createText();
			image = captchaProducer.createImage(capStr);
		}

		redisService.setCacheObject(verifyKey, code, Constants.CAPTCHA_EXPIRATION, TimeUnit.MINUTES);
		// 转换流信息写出
		FastByteArrayOutputStream os = new FastByteArrayOutputStream();
		try {
			ImageIO.write(image, "jpg", os);
		} catch (IOException e) {
			return AjaxResult.error(e.getMessage());
		}

		ajax.put("uuid", uuid);
		ajax.put("img", Base64.encode(os.toByteArray()));
		return ajax;
	}

	/**
	 * 校验验证码
	 */
	@Override
	public void checkCaptcha(String code, String uuid) throws CaptchaException {
		if (StringUtils.isEmpty(code)) {
			throw new CaptchaException("验证码不能为空");
		}
		if (StringUtils.isEmpty(uuid)) {
			throw new CaptchaException("验证码已失效");
		}
		String verifyKey = CacheConstants.CAPTCHA_CODE_KEY + uuid;
		String captcha = redisService.getCacheObject(verifyKey);
		redisService.deleteObject(verifyKey);

		if (!code.equalsIgnoreCase(captcha)) {
			throw new CaptchaException("验证码错误");
		}
	}
}
